Hi, +1 for Mayeul Nathan. This "virtual column" would be a very handy tool ! E.G for labelling
kimaidou 2011/7/28 Andreas Neumann <a.neum...@carto.net> > Hi Nathan, > > Good to hear that you are working on this. > > I just wonder if it wouldn't make sense to have a general purpose "virtual > column" that could be introduced in QGIS. This would be useful for: > > * labeling > * map tips/QGIS server tooltip display > * symbology > * plugins > * others? > > It would be convenient to use the field calculator, but instead of just > writing out to a physically existing column it would create a new virtual > column, just like a virtual column in a database view. > > Otherwise one would have to develop the same functionality several times - > for labeling, for tooltips, etc. > > Do you think it would be feasible to implement this on a lower level in > QGIS so that users could transparently work with virtual columns wherever > they want? > > Andreas > > On Thu, 28 Jul 2011 16:09:56 +1000, Nathan Woodrow wrote: > >> My upcoming patch that adds expression based labels will be able >> to achieve this once it's completed; I'm just cleaning up the UI >> and testing everything then I will get the guys to merge it in. >> Until then you will need to create a new column. >> >> - Nathan >> >> On Wed, Jul 27, 2011 at 9:15 PM, Torsten Lange wrote: >> >> Ok, thank you, Andreas! >>> >>> Torsten >>> >>> Am Mittwoch 27 Juli 2011, 11:00:01 schrieb Andreas Neumann: >>> >>> Hi, >>>> >>> > >>> > Currently, you have to create a new column. I usually create a >>> view in >>> > Postgis for this purpose. >>> > >>> > It is in on the wishlist that one can create a "virtual" column >>> - not >>> > only for labeling, but also for map tips and perhaps >>> symbolization. >>> > Until then you have to do it yourself. >>> > >>> > Andreas >>> > >>> > On Tue, 26 Jul 2011 22:51:34 +0200, Torsten Lange wrote: >>> > > Hi, >>> > > >>> > > Is there a way just to print - lets say - the first four >>> letters of a >>> > > objects >>> > > name? Or must I create a new row for that? >>> > > >>> > > Thank you, Torsten >>> > > ______________________________**_________________ >>> > > Qgis-user mailing list >>> > > qgis-u...@lists.osgeo.org [1] >>> > > http://lists.osgeo.org/**mailman/listinfo/qgis-user<http://lists.osgeo.org/mailman/listinfo/qgis-user>[2] >>> >>> ______________________________**_________________ >>> Qgis-user mailing list >>> qgis-u...@lists.osgeo.org [3] >>> http://lists.osgeo.org/**mailman/listinfo/qgis-user<http://lists.osgeo.org/mailman/listinfo/qgis-user>[4] >>> >> >> >> >> Links: >> ------ >> [1] mailto:Qgis-user@lists.osgeo.**org <qgis-u...@lists.osgeo.org> >> [2] >> http://lists.osgeo.org/**mailman/listinfo/qgis-user<http://lists.osgeo.org/mailman/listinfo/qgis-user> >> [3] mailto:Qgis-user@lists.osgeo.**org <qgis-u...@lists.osgeo.org> >> [4] >> http://lists.osgeo.org/**mailman/listinfo/qgis-user<http://lists.osgeo.org/mailman/listinfo/qgis-user> >> [5] mailto:tla...@gwdg.de >> > > -- > -- > Andreas Neumann > Böschacherstrasse 10A > 8624 Grüt (Gossau ZH) > Switzerland > ______________________________**_________________ > Qgis-developer mailing list > Qgis-developer@lists.osgeo.org > http://lists.osgeo.org/**mailman/listinfo/qgis-**developer<http://lists.osgeo.org/mailman/listinfo/qgis-developer> >
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